SMH4802

SUMMIT MICROELECTRONICS, Inc. www.DataSheet4U.com SMH4802 Preliminary Information See Last Page Programmable -48V Hot-Swap Controller with Forced Shut Down FEATURES & APPLICATIONS l Soft Start Power Supply l Live Insertion into a -48V backplane l Programmable Control of a DC/DC Converter w I2C Power On/Off Control l Highly Programmable Circuit Breaker w Active In-rush Current Limiting w Over-current Filter Circuit Breaker Immunity to Voltage Steps and Current Spikes l Programmable Forced Shutdown Timer l Internal Shunt Regulator Allows a Wide Supply Range l 14-pin SOIC and 16-pin SSOP packages APPLICATIONS l -48V Power Distribution w w w w Telecom Line Cards Central Office Switching High Availability Servers Hot Board Insertion INTRODUCTION The SMH4802 is designed to control in-rush current during hot swapping of plug-in cards operating in a distributed power environment. The device drives an external power MOSFET switch that connects the supply to the load and protects against over-current conditions that might disrupt the host supply. It also provides undervoltage and over-voltage monitoring of the host power supply. When the source and drain voltages of the external MOSFETs are within specification it will provide a Power Good logic output that can be used to enable a DC/DC converter. Additional features of the device include: temperature sense or master enable input, a 5V reference output for expanding monitor functions, and duty-cycle or latched over-current protectio...